Modified graphene and preparation method thereof
A graphene and modification technology, applied in the field of materials, can solve the problems of large specific surface area of graphene, restricting the application of graphene, and thermodynamic instability, etc., achieving the effects of easy acquisition, easy satisfaction of operating conditions, and cost reduction
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Embodiment 1
[0037] A preparation method of modified graphene, specifically comprising the following steps:
[0038] 1) Add 500 g of 60-mesh natural flake graphite into 5 L of concentrated sulfuric acid at 0°C and stir for 2 h; then slowly add 225 g of potassium persulfate and 250 g of phosphorus pentoxide, stir for 3 h at 20°C, and then heat up to Stir at 40°C for 24 hours, then slowly add 20 L of water and stir for 2 hours, then slowly add 0.9 L of 30% hydrogen peroxide to obtain a suspension of bright yellow particles; separate the bright yellow particles by centrifugation, wash with water , dried in vacuum at 60°C for 12 h to obtain 486 g of graphene oxide;
[0039] 2) Add 480 g of graphene oxide into 4 L of thionyl chloride, reflux and stir at 80 °C for 24 h, then centrifuge, wash with acetone, and vacuum-dry at room temperature for 12 h to obtain Graphene 475 g;
[0040] 3) 470 g of graphene containing acid chloride groups on the surface and 305.5 g of 1,3-propanediamine were added...
Embodiment 2
[0044] A preparation method of modified graphene, specifically comprising the following steps:
[0045] 1) Add 1000 g of 100-mesh natural flake graphite to 10 L of concentrated sulfuric acid at 2°C and stir for 2 h; then slowly add 450 g of potassium persulfate and 500 g of phosphorus pentoxide, stir for 3 h at 23°C, and then heat up to Stir at 43°C for 24 hours, then slowly add 40 L of water and stir for 2 hours, then slowly add 1.8 L of 30% hydrogen peroxide to obtain a suspension of bright yellow particles; centrifuge the bright yellow particles, wash with water , dried under vacuum at 62°C for 16 h to obtain 990 g of graphene oxide;
[0046] 2) Add 985 g of graphene oxide into 7.88 L of thionyl chloride, reflux and stir at 80 °C for 28 h, then centrifuge, wash with acetone, and vacuum-dry at room temperature for 14 h to obtain Graphene 980 g;
[0047] 3) Add 980 g of graphene containing acid chloride groups on the surface and 637 g of 1,3-propanediamine to 4.2 L of N,N'-...
Embodiment 3
[0051] A preparation method of modified graphene, specifically comprising the following steps:
[0052] 1) Add 1500 g of 160-mesh natural flake graphite to 15 L of concentrated sulfuric acid at 0°C and stir for 3 h; then slowly add 675 g of potassium persulfate and 750 g of phosphorus pentoxide, stir for 4 h at 22°C, and then raise the temperature to Stir at 45°C for 36 h, then slowly add 60 L of water and stir for 3 h, then slowly add 2.7 L of 30% hydrogen peroxide to obtain a suspension of bright yellow particles; centrifuge the bright yellow particles and wash them with water , dried under vacuum at 65°C for 18 h to obtain 1475 g of graphene oxide;
[0053] 2) Add 1470 g of graphene oxide into 11.76 L of thionyl chloride, reflux and stir at 80 °C for 32 h, then centrifuge, wash with acetone, and vacuum-dry at room temperature for 16 h to obtain Graphene 1450g;
[0054] 3) 1450 g of graphene containing acid chloride groups on the surface and 942.5 g of 1,3-propanediamine w...
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